This part briefly reviews other \({\mathtt {TFC}}\)  measures and the related sociological theory.
In particular,
prior \({\mathtt {TFC}}\)  measures can be explained by either selection or influence mechanism in the homophily principle [1]}.
The selection indicates that people tend to form friendships with others with similar characteristics. In contrast, the influence can be treated as the inverse of selection, claiming that people may modify characteristics to conform to their friends. We categorize \({\mathtt {TFC}}\)  measures based on the taxonomy of selection and influence.
